John b



N.FETERS PHO'TUUTHOGRAPHEP. WASHINGTON. D. C.

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`Laim mem No; 77,909, ma May 12, 1868e IMPROVEMENT IN REVERSIBLE KNOB-LATGHES.

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TO' ALL WHOM IT MAY CONCRN:

Be it known that I, JOHN E. PARKER, of Meriden, in the county of New Haven, and State of Connecticut,- have invented a new Improvement in Knob-Latehes and I do hereby declarethe following, when taken in connection with the accompanying drawings, and the letters of reference marked thereon, to be a full, clear, andV exact description of the same, and which said drawings constitute part of this'specieation, and represent, in

Figure 1, a side view of the lock with one plate removed, and, in r Figure 2, a portion of .the same section illustrating this invention.

This invention relates to an improvement inknob-latc'hes, the` object being tooonstrnct the operative mechanism of the latch-bolt so that the latch-holt may be reversed for a right or left-hand door, and consists in formin'gha projection upon thelyoke, which enters -a hole in the latch-bolt, so as to attach the latch-bolt to the yoke, and combining therewith l an arm whichprojects through the edge of the caseso that the yoke may be raised from the latch-bolt to permit its withdrawal, and the latch-case provided with guides to direct and hold the latch-bolt in place. l

In order to the clear understanding of my invention, I will fully describe the same, as illustrated in the accompanying drawings.

A is the latch-case, B the lock-bolt', arranged therein in the usual manner.Y C is the follower, through,

which the knob-spindle passes; B, the yoke, constructed with a spindle, C, upon which the springis placed, which forces the yoke forward to the position denoted in the ,drawings in the usual manm Upon the lower edge of the yoke I form aprojection, a, and in the tail D, ofthe latch-holt E, I form an opening corresponding.to the projection a, and also a projection, F, upon the yoke, as a rest for the tail-,end of the latch-bolt.

Formed upon or attached tothe lyoke in any convenient manner, is a projecting arm, G', which extends up through the upper edge of the case, and .by which the yoke may be raised to the position denoted in fig. 2, and when so raised the latch-bolt may heinserted'in either a rightV or left-hand position, and in being so inserted is' guided to its proper position `by the converging guidesd formed upon the case, and is arresteud,'whcn inserted to the proper distance, bythe projection F, and when so inserted press upon Vthe arm G and force the yoke ba'ck into the position denoted in fig. 1, lthe projection a entering the perforation in the tail of the latch-bolt.- This secures the latch-holt firmly to the yoke, and the latch operatesin the usual manner. y

If desired to reverse the latch-bolt, raise the yoke, as denoted in iig. 2, withdraw the latch from the guides d d, reverse, and return, as before described. 1

In box-locks, or such as are placed upon the surface of the door-and secured to the doorby screws passing through the lock-case, it is necessary to prevent the accidental detachment of the latch-bolt. Itherefore form one of the holesfin such proximity to the spindle C, or a part attached thereto, that when the yoke is in the proper position, as denoted in iig. 1, a screw, inserted through the holef, will prevent the raising of the yoke. In mortise-locks this arrangement is not essential. Y

.As represented in the drawings, the 'arm C forms a fixed seat for one end of the spring, while the othei` end hears against the head on the end of the spindle; therefore, it will beobserved that the yoke and spindle, when moved by the door-knobs to operate the bolt, move independent of the arm G.

Having thus fully described my invention, what I claim as new and useful, and desire to secure by Letters Patent, is` f 1. The yoke B, provided with a n'rojeeton, a, and'arranged so as to beraised from the latch-bolt, substantially as shown.- l

2. In combination with the above, I claim the ixed guides d d for guiding and holding the latch-bolt in position, substantially as described.

3. The arm G, constructed so as to form a seat for the spring on the spindle C, and also as a means for operating the yoke B, to permit the removal of the latch-bolt, substantially as herein set forth. y

' JOHN E. raakten.`

'Witnesses A. J..T1nmrs,

J. H. SHUMWAY. 

